Valve for pumps, &amp;c.



No. 709,273. Patented Sept. I67, I902.

T. A. MACDONALD. VALVE F08 PUMPS, &c.

(Application filed Oct. 20, 1898.)

' (No Model.)

n1: Nonms PETERS co. PHOTOLITHQ, wAsnmcwom D. c;

UNITED STATES PATENT UFFicE.

THOMAS A. MACDONALD, OF BOSTON, MASSACHUSETTS.

VALVE FOR PUMPS, 800.

SPECIFICATION formingpart of Letters Patent No. 709,273, dated September 16, 1902.

Application filed October 20, 1898. Serial 110- 694,148. (No model.)

T0 at whont it may concern:

Be it known that I, THOMAS A. MAoDoN- ALD, a citizen of Canada, residingin Boston, in the county of Sufiolk and State of Massachusetts, have invented new and useful Improvements in Valves for Pumps and other Purposes, of which the following is a specification.

My invention relates to improvements in valves for pumps, and especiallyfor doubleacting pumps used for water-closets on board yachts andvessels. l

The objects of my improvement are to provide a system of valves for a double-acting pump used for pumping out and flushing water-closet bowls either above or below the water-line in yachts and vessels which will allow one end of the pump to be operated for one purpose without resistance to the movement of the piston when the valve in the suction-pipe of the other end isclosed; also; to prevent sea-water from flowing into the bowl when the valve in said suction-pipe is opened or permitted to operate freely as a checkvalve in cases where the closet is placed below the water-line. I attain these objects by the mechanism illustrated in the following drawing, which is a vertical section of the device, referring to whichh h h 72. form the shell or outer casing.

10 is the suction pipe.

r is the discharge-pipe connecting to the top of the closet-bowl, and 0 is a pipe which is attached to one end of a double-acting pump.

m is a valve operating both as a check-valve and a shut-off valve in the suction-pipe.

n is a check-valve in the discharge-outlet of the pump.

10 is a hollow piston or slide-valve having apertures e and f and in which is placed an air-check valve 0.

j is a rod connecting with hollow piston or slide-valve p.

sis a spiral spring which forces piston 19 down upon valve in, holding it closed against the sea-pressure, and by the engagement of the lower end of piston 19 with the end of lever. 15 holds check-valve n up but when piston 12,

is pulled up by rod j check-valve m is permitted to operate freely as a check-valve, and also check-valve n, which drops to its seat as soon as the pressure is taken Off the end of lever '6, acts as a check-valve.

y is an aperture in the outer casing or shell h h h h, through which air passes when piston p is down and the valve m is held closed; but when piston 19 is pulled up, so as to allow valve on to operate freely as a check-valve, then aperture 3 is closed by the upper end of piston 19 sliding over it.

if is a lever, one end of which forces checkvalve or up from its seat when piston 19 is down by the engagement of piston 19 with the opposite end.

g is a spring which holds check-valve n closed against the sea-pressure when. piston p is held up so as to allow valve on to operate as a check-valve. This spring prevents the sea-water from flowing freely into the bowl when pistonp is held up, and the clean water must be forced through apertures a and b b by the operation of the pump against the pressure of spring g, which is little more than is necessary to resist the sea-pressure.

The device as shown in the drawing represents the valve m in the suction-pipe 10 held closed by the pressure of spring 8 on piston 19 and the air-inlet y open, also checkvalve 17. in the discharge-pipe 7' open. This allows the air to flow freely in and out of one end of the cylinder of a pump, to which pipe 0 is connected, thus preventing any resistance by vacuum or pressure to the movement of the piston when the other end of the pump is being used for pumping out the contents of a water-closet bowl or other purpose. The air passing in through aperture y, air-check valve 0, aperture f, and pipe 0 to the pump would not pass freely up through aperture or against the pressure of spring 9 unless checkvalve n was forced up from its seat by lever t, and though lever 15 is shown to be inside of valve-shell h h h h it may be placed outside of said valve-shell, one end being attached to valve n and the other to rod j or other ordinary attachment of tl16l6V01,Wl1lGll will serve the same purpose; but I prefer to use it as shown and described. Also a lever is shown for the purpose of pulling up rod j; but any ordinary well-known device for accomplishing this purpose may be used. Also air-check valve 0 is shown to be inside of piston 19 at aperture 6. It may be placed anywhere in the air-conduit from chamber 70 to pipe 0 or be connected to aperture y outside of valveshell 72. h hh and will serve the same purpose; but I prefer to use it as shown and described, and though the air-conduit is shown to be from chamber 70 to pipe 0 through hollow piston p chamber 70 may be connected to pipe 0 or the cylinder of the pump byany other means and serve the same purpose. Therefore I do not confine myself particularly to the manner illustrated and described in regard to the above-mentioned details.

It will be seen from the drawing and the above description that valve m in suctionpipe to serves both as a check-valve and a shut-01f valve combined in one and also that check-valve n, with spring gin the dischargepipe 1', serves also as a sufficient shut-off valve to prevent the sea-Water from flowing freely into the water-closet bowl when the pressure is taken off of valvem in cases where the closet is placed below the water-line in yachts and vessels.

I am aware that prior to my invention valves have been made for suction-pipes of pumps whereby an air-vent to the pump is provided for when the valve in the suctionpipe is closed. Therefore I do not claim such a combination broadly.

What I do claim as my invention, and desire to obtain Letters Patent for, is

1. A pump-valve mechanism comprisinga shell or casing having an inlet or suction pipe, a chamber having a side aperture, a hollow piston or slide valve movable in said chamber, a suction-pipe valve adapted to be held to its seat by said piston, and means for moving the piston to open the valve and close the .piston, and means for moving the piston to release the valve and to simultaneously close the side aperture in the casing and the airoutlet from said piston.

3. A Valve mechanism for pumps comprising a shell or casing having suction and discharge connections w r, and a pump connection 0 and a chamber 70 opposite the suction connection, a piston-valve p in said chamber, a valve m guided by said piston, means for moving said piston in the chamber is, and means controlled bysaid piston for admitting air to the valve-shell below said piston.

4. A valve mechanism for pumps comprising a shell or casing having suction and discharge pipes, valves m and n for said pipes respectively, and means including a lever for causing the simultaneous alternate movements of said valves, a movable piston to which the valve m is connected, said piston bearing on one end of the lever, and a spring bearing on the valve n.

THOMAS A. MACDONALD.

Witnesses:

- BAIRD T. DICKINSON,

ALEXANDER DICKINSON. 

